AD9547SLASHPCBZ datasheet(50/104 Pages) AD

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AD9547

Rev. 0 | Page 50 of 104

SERIAL CONTROL PORT

13-BIT ADDRESS

SPACE

READ-ONLY

REGION

READ/WRITE

REGION

ANALOG BLOCKS AND

DIGITAL CORE

POWER-ON RESET

SERIAL CONTROL ARBITER

SPI

I2C

EEPROM

CONTROLLER

400kHz

MULTI-

FUNCTION

PIN CONTROL

LOGIC

SCLK/SCL

CS/SDA

SDIO

SDO

EEPROM

Figure 49. Serial Port Functional Diagram

The AD9547 serial control port is a flexible, synchronous serial

communications port that provides a convenient interface to many

industry-standard microcontrollers and microprocessors. The

AD9547 serial control port is compatible with most synchronous

transfer formats, including Philips I2C, Motorola® SPI, and

Intel® SSR protocols. The serial control port allows read/write

access to the AD9547 register map.

In SPI mode, single or multiple byte transfers are supported.

The SPI port configuration is programmable via Register 0x0000.

This register is integrated into the SPI control logic rather than

the register map and is distinct from the I2C Register 0x0000.

It is also inaccessible to the EEPROM controller.

A functional diagram of the serial control port, including its

relationship to the EEPROM, appears in Figure 49.

Although the AD9547 supports both the SPI and I2C serial port

protocols, only one is active following power-up (as determined

by the multifunction pins, M0 to M2, during the startup sequence).

That is, the only way to change the serial port protocol is to reset

the device (or cycle the device power supply). Both protocols

use a common set of control pins as shown in Figure 50.

AD9547

SCLK/SCL

CS/SDA

SDO

SDIO

SERIAL

CONTROL

PORT

Figure 50. Serial Control Port

SPI/I2C PORT SELECTION

Because the AD9547 supports both the SPI and I2C protocols,

the active serial port protocol depends on the logic state of the

three multifunction pins, M0 to M2, at startup. If all three pins

are set to Logic 0 at startup, the SPI protocol is active. Otherwise,

the I2C protocol is active with seven different I2C slave address

settings that are based on the startup logic pattern on the M0 to

M2 pins (see Table 29). Note that the four MSBs of the slave

address are hardware coded as 1001.

Table 29. Serial Port Mode Selection

Serial Port Mode

SPI

I²C (address = 1001001)

I²C (address = 1001010)

I²C (address = 1001011)

I²C (address = 1001100)

I²C (address = 1001101)

I²C (address = 1001110)

I²C (address = 1001111)

SPI SERIAL PORT OPERATION

Pin Descriptions

The SCLK (serial clock) pin (SCLK/SCL) serves as the serial

shift clock. This pin is an input. SCLK synchronizes serial

control port read and write operations. The rising edge SCLK

registers write data bits, and the falling edge registers read data

bits. The SCLK pin supports a maximum clock rate of 40 MHz.

The SDIO (serial data input/output) pin is a dual-purpose pin

and acts either as an input only (unidirectional mode) or as both

an input and an output (bidirectional mode). The AD9547

default SPI mode is bidirectional.

The SDO (serial data out) pin is useful only in unidirectional

I/O mode. It serves as the data output pin for read operations.

The CS (chip select) pin (CS/SDA) is an active low control that

gates read and write operations. This pin is internally connected

to a 30 kΩ pull-up resistor. When CS is high, the SDO and

SDIO pins go into a high impedance state.

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